Screen.



IF. J. REMBUSGH.

SCREEN.

APPLIOATION FILED JUNE 29,1909.

Patented Oct. 19,1909.

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' FRANK J. REMIBUSGH, or sHELBYvrnLE, INDIANA.

Y SCREEN.

Specification of Letters Patent.

Patented Oct. 19, 1909.

Application filed June 29, 1909. Serial No. 505,050.

' .To all whom it may concern:

Be it known that I, FRANK J. REMBosoH, a citizen of the United States, and a resldent of Shelbyville, in the county of Shelby and State of Indiana, have invented a new and Improved Screen, of which the following is a full, clear, and exact description.

1 My invention relates to screens, my more particular purposebeing to provide a screen which oflers a total obstruction to the passage of light through it and in this manner improves the distinctness, clearness and brilliancy of images thrown upon the screen.

My improved screen. permits of general use and is of special service in connection with apparatus for exhibiting moving pictures and stereopticon views. a

More specifically stated, my invention comprehends a screen made principally of glass or other transparent or translucent material and provided upon one of its faces with a reflecting surface and having its opposite face roughened, and partially opaque, the idea being that when light strikes this face a portion of the light is stopped, yet some light filters through, strikes the reflecting surface, and is turned back so as to reach the roughened surface the second time,

but from the opposite side. This greatlyincreases the illuminating effect of the light upon the screen and renders the image, if

' any, more distinct and vivid. Moreover the image appears to be nearer the observer.

My invention further relates to an improved method for preparing screens of the kind mentioned above.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in both the figures.

Figure 1 is a viewpartly in perspective and partly in section, showing a screen made in accordance wit'h my invention, this screen being formed of a plate of glass provided with a roughened front face and w1th a silvered back face; and Fig. 2 is a cross section through another screen made 1n accordance with my invention, in this instance the front face being rendered partially opaque bya piece of wet silk spread over it.

In Fig. .1 a'plate of glass a is provided with a backing b of silver or other reflectlate of glass is further provided with a acing a made by sandblasting, etching, or otherwise roughening i one face of the plate. I find it a good plan swers the purpose very well. Before applying the silver the surface to which it is to be applied is highly polished. This renders the metallic coating much more. even and greatly improves its power ,toreflect.

In the form shown in Fig. '2 the plate of glass is shown at d and is provided with a backing f of silver, as before, but the front face is roughened by the application of a piece ofv silk cloth 6 to it. This cloth is then wet and is pressed evenly against the glass for the purpose of removing all bubbles. Except for the glass being roughened by the wet silk cloth, the construction and action represented in Fig. 2 are exactly the same as that in Fig. 1. I The operation ofmy device is as follows: An image being thrown upon the plate, the light used for defining the image first strikes the roughened face 0 and is, in a great measure, reflected and diffused by this face. The portion of the light which manages to passthis face, however, is not wasted. It passes through the plate and striking against tion of the roughened surface 0.

One remarkable fact about screens of this type is that they render the use of light less objectionable for purposes of illuminating the hall or room where the device is in use.

terially with the images produced upon the screen. This is a good feature for the reason that many objections to moving picture shows are based upon the idea that the hall or room where such exhibitions occur is, during a good portion of the time, involved in darkness. 1

Since it is a well settled principle in optics that the angle of incidence isequal to the angle of reflection, the rays when reflected back from the metallic surface 6 to the roughened-surface 0 maynot strike the cise point where they first passed through the roughened surface, but the discrepancyv is exceedingly small and the net result 1s that to spread over the plate a thin web of silk the coating 6 of metal is reflected back and thus increases the virtual degree'of illuminaconsiderable extent, without interfering mapren makes a partially opaque surface which an- 9 the image "osse's'se's great clearnss and is sharply de ned.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1 1. A screen, comprising a body portion capable of'transmitting light, said body portion being provided with a roughened surface and further provided with a reflecting surface disposed opposite to said roughened surface.-

2.- A. screen, comprising a body portion provided with two faces disposed arallel with each other, one of said faces sing a roughened surface and the other of said faces being provided with a reflecting surface.

3. A screen, comprising a plate of glass having one of its faces roughened and having its opposite face smooth but provided with a metallic coating for reflecting light.

4. A screen, comprising a plate of glass provided upon one of its faces with means for preventing some of the light rays which strike it from passing into the plate, said ea'auo platebeing further provided upon its oppo site face with means for reflecting such of the light rays as reach it through the glass;

5. A screen, comprising a body portion 7 surface.

6, A screen comprising a plate of material through which light is adapted to pass, one face of said plate being partially opaque and the other face of said plate being so formed as to reflect light rays.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANK J. REMBUSCH.

Witnesses:

THOMAS H. CAMPBELL, ALBERT F. WRAY. 

